A customer has reported that when using a cable to connect an older laptop to a 100Mbps switch that the link light does not illuminate. When testing the same cable with a newer 1Gbps switch, it works fine. Which of the following is the MOST likely cause of the problem?

A.
The port on the old switch has failed.

B.
The cable is pinned as a crossover.

C.
The older switch is not compliant with the new cable specifications.

D.
The laptop has a failed network card.